If you use Malwarebytes it can block websites. If you want it to stop blocking your favorites sites, try this:

Malwarebytes blocked access to potentially malicious website

If you are visiting websites and have Malwarebytes Anti-malware running it can happen that it blocks certain websites. Most of the time these sites are malware sites. However, there are many false positives.

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To stop Malwarebytes from blocking your websites, wait until the popup appears that the website has been blocked and then right-click on the Malwarebytes tray icon and click on add to Ignore list:

Stop malwarebytes from blocking sites

However, this does not always work. If it does not work, disable the Malwarebytes protection temporarily or permanently:

Right-click on the tray icon and uncheck Enable Protection

Disable malwarebytes protection